<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
    <title>JS Bin</title>
    <style>
        div {
            height: 100px;
            width: 80.55555%;
            background-color: #FEDD;
        }
    </style>
</head>

<body>
    <div></div>
</body>

</html>